(CNN) - Cindy McCain, wife of Republican presidential candidate John McCain, appears to have sharpened her attacks against Barack Obama on the campaign trail in the final stretch of the race for the White House.

One day after she told a Tennessee newspaper Obama is running the "dirtiest campaign in American history," Mrs. McCain criticized the Illinois senator for voting against a bill to fund troops in Iraq, a regular line of attack from her husband’s campaign.

“The day that Senator Obama cast a vote not to fund my son when he was serving sent a cold chill through my body, let me tell you,” she told a Pennsylvania crowd before introducing her husband and Republican VP candidate Sarah Palin.

“I would suggest Senator Obama change shoes with me for just one day. I suggest he take a day and go watch our men and women deploying," she also said, to boisterous cheers from the campaign.

The vote Mrs. McCain is referencing came in May of 2007, when Obama was one of 14 senators who voted against a war-spending plan that would have provided emergency funds for American troops overseas.

He, like many Democrats, was pushing for an end to the war in Iraq, and the legislation included no provisions for that. Before that vote, Obama did support and vote for a funding proposal that included a timeline for withdrawal from Iraq - a troop funding bill McCain opposed.
A CNN fact check deemed the charge that Obama voted against troop funding "misleading."